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expeople1 [14]
3 years ago
11

What is 19.5 rounded to the nearest whole number? Enter your answer in the box.

Mathematics
2 answers:
elena55 [62]3 years ago
4 0
20

I think sorry if it’s wrong
wolverine [178]3 years ago
4 0

Answer:

19.5 is about 20

Step-by-step explanation:

5 or more you round up

4 or less it stays the same

19.5

0.5 it's 5 so you round up to 20

19.5 ≅ 20

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Answer:

43.8°

Step-by-step explanation:

Applying,

Cosine rule,

From the diagram attached,

x² = y²+z²-2yxcos∅.................... Equation 1

where ∅ = ∠YXZ

Given: x = 8.7 m, y = 10.4 m, z = 12.4 m

Substitute these values  into equation 1

8.7² = 10.4²+12.4²-[2×10.4×12.4cos∅]

75.69 = (108.16+153.76)-(257.92cos∅)

75.69 = 261.92-257.92cos∅

collect like terms

257.92cos∅ = 261.92-75.69

257.92cos∅ = 186.23

Divide both sides by the coefficient of cos∅

cos∅ = 186.23/257.92

cos∅ = 0.722

Find the cos⁻¹ of both side.

∅ = cos⁻¹(0.7220)

∅ = 43.78°

∅ = 43.8°

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